Cell Division HS 1178
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This 0 page Class Notes was uploaded by Pei_Yee on Sunday November 8, 2015. The Class Notes belongs to HS 1178 at Nanyang Polytechnic taught by Dr CB Tan in Fall 2015. Since its upload, it has received 155 views. For similar materials see Human Bioscience 1A in Biological Sciences at Nanyang Polytechnic.
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Date Created: 11/08/15
HS 1178 Cell Division introduction Growth maintenance differentiationamp new individual underdoes cell division reproduction 2 types of cell division Mitosis Meiosis Ce Life Cycle nterphase functional W h r mawHl Samarats m RsW E uH for remudmnmw miw a V e S p e 0 d Mimi Phase varies cell type S phase DNA replication increase histone production G phase duplication of organelles GZ phase synthesis of dividing apparatus M phase nuclear division i I JFIFIHI grown and E iifi i 7 jasthriw l i a 39 gammath mitosis e if H i Kg g E Cytokinesis separation of nucleus Miamibase Consists of 2 phase Interphase Phase when ce perform their normal func ons Forms the major portion of the cell s life Mitosis Phase when cell division MITOSIS Process that separated replicated chromosomes of cell into 2 identical nucleic Divided into 4 stages Prophase Metaphase Anaphase Telophase Mitosis Maternal l Paternal Interphase Prophasa Metaphase Anaph Tepgg 1Prophase Chromatin coils tightly visible as chromosomes 2 copies of chromosomes each copy is a chromatid the pair is held together by kinetochore Mitotic spindle appears as centrioles move to opposite sides Nucleoli nuclear membrane disappear 2Metaphase chromatids line up at metaphase plate 3Anaphase Chromatid pair separate and move to opposite poles of cell 4 Telophase Nucleolus and nuclear membrane reappear Chromosomes uncoil form Chromatid Mitotic spindle disappears MEIOSIS somewhat similar to mitosis only occurs in primitive germ cells Produces haploid gametes sperm or oval with 23 chromosomesn Involves 2 cell divisions Meiosis l Meiosis Pirophase l Metapl lase l Ainaphasei Telopha e ll 1Prophase I The chromatin begins to condense following interphase Synapsis aligns homologs and chromosomes shorten Chiasmata become evident Coiling and shortening of the chromosomes conUnue 2Metaphase l The chromosomes line up on the equatorial metaphase plate 3Anaphase l The homologous chromosomes move to opposite poles of the cell 4Metaphase Il Kinetochores of the paired chromatids line up across the equator of each cell 5Anaphase Il The chromatids of the chromosomes nally separate becoming chromosomes in their own right and are pulled to opposite poles 6Telophase The chromosomes gather into nuclei and the cell divide 7Products of meiosis Each of the four cell has a nucleus with a haploid number of chromosomes Mitosis VS Meiosis Mitosis Meiosis In all somatic cell Only in germ cell 1 cell division 2 cells divisions 2 diploid daughter cell 2n 4 haploid daughter cells n Identical copies made Each daughter ce always different
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